Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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Is every copy of the blockchain the same? If I have an error within file should I be able to copy this file from a backup and reindex chainstate?

I recently moved the first 2000 files of my blockchain from the SSD to a HDD. The HDD gets mounted in /mnt/ext. A symlink per file is then put into blocks that points to the remote files. So my blocks ...
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Ethereum vs ERC20 Tokens - What's The Relationship? [closed]

I read that "ERC20 token transactions consume processing power on the Ethereum platform. Processing power costs gas, which is paid for with Ether." Is this true? I feel like it's not. For ...
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Scalability problem: is the end of Bitcoin near?

I was reading in Wikipedia that the blockchain can only handle around 7 transactions per second: https://en.wikipedia.org/wiki/Bitcoin_scalability_problem With the soft fork for SegWi, I can imagine ...
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Blockchain.com wallet

Just a basic/general question, recently when I send bitcoin using blockchain.com's wallet I noticed within my transaction logs Received BTC to: BTC Trading Wallet. From: BTC Wallet directly after Sent ...
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again: missing turnover [duplicate]

I should receive a bigger amount of bitcoins to my wallet. Now I got the message: missing turnover 2,1 BTC. I got explained, the amount was to big so I have to put in 2,1 BTC in my wallet so that it ...
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Blockchain wallet [closed]

Just a basic/general question, recently when I send bitcoin using blockchain.com's wallet I noticed within my transaction logs Received BTC to: BTC Trading Wallet. From: BTC Wallet directly after Sent ...
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1answer
24 views

verification of wallet to be verified

To have btc transferred into a wallet does it need a certain amount of btc in the wallet for it to be verified. Does this amount depend on total btc to be transferred
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Why Ripple is able to process transaction faster than ethereum and bitcoin? [duplicate]

I was wondering what makes Ripple very fast(Transaction per seconds) rather than Ethereum and Bitcoin? Currently, I'm doing a research on how to reduce transaction confirmation time in blockchain. Is ...
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Is it normal that blk and rev files are blank?

I am trying to run a full node on a Raspberry Pi 3. My computer is also not so good for initial block download. So I got a borrowed computer and synced the whole blockchain overnight. Then I copied &...
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How to accelerate the long time for bitcoin-core to sync the blockchain? [duplicate]

How can I accelerate: the process of sync'ing bitcoin-core for console usage? Pokey internet. Can't I sync recursively and in the background? Just looking to learn by playing and using console ...
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What are the benefit of mining an empty block

Something peculiar just happened on the newly mined block number 655534, it contain only the coinbase transaction, nothing else. I have searched for a similar question but only found this one Why ...
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1answer
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How does initial exchange of inventory work when both nodes have different chains?

When two nodes connect to each other and exchange getblocks messages but they have different blockchains will both nodes download each others blockchain to verify which has higher chainwork or will ...
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how does bitcoinjs-lib grab utxo

So, Let's say I want to create a transaction by using bitcoinjs-lib. As far as I can see, this library doesn't provide the help so that it can automatically figure out/grab unpent transactions for ...
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how to get txid with sha256

I am trying to get a txId from a transaction without any bitcoin libraries. I can use low level libries though such as crypto, sha256 and so on. I have a class which contains version, vins, vouts, ...
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1answer
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How to improve bitcoin-qt when downloading blockchain? (very technical, dev views appreciated)

GitHub suggested discussing here before bothering developers with an issue. So be it! :) I'm running Bitcoin Core Version v0.20.1 and Linux Mint 18.3 on crappy old hardware. Pruning blockchain to 2 G ...
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can someone give me an example on how collaboration is difficult without the Blockchain?

i understand the technology and i understand how it helps in two domains which are voting and currency but i don't understand how the Blockchain helps in other domains such as health care or ...
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Bitcoin sent , no confirmation on receiver’s or sender’s end [duplicate]

Transaction ID: f6132f9d9e1b80d0c852a40a172d870a3f3d4a5a8f6706300a91bc704731cf96 I do not know what is going on. I have sent the bitcoin to the receiver’s address on the same wallet and the receiver ...
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1answer
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How to develop a crypto exchange leveraging on third party API like coinbase, blockchain.com [closed]

I got a request as a developer to develop a bitcoin exchange site like https://mypatricia.co/ or https://instantcoins.ng/ I am to leverage on third party API like Coinbase, blockchain, it could be ...
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2 days 0 confirmations [duplicate]

2 days 0 confirmations how long will this continue? if the bitcoin price fell in 48 hours, or maybe more, my expectation, who will compensate me for the loss. I explain it was bought specifically for ...
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1answer
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Can you help me see if I have an old Bitcoin account? [closed]

I set up an crypto account & had different coins in it, but the computer died, updated to a current machine. Have also changed from AOL to Gmail, that was around 98 or 99, if that gives you any ...
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Initial blockchain sync stuck on block 237158

Stuck on block 237158. Rebooting doesn't work. Do I need to start from scratch? admin@raspberry2bit:~ $ sudo tail -f /mnt/ext/bitcoin/debug.log 2020-10-26T08:48:30Z Loading addresses from DNS seed ...
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Is it bad idea to store my passwords on blockchain with a smart contract? [migrated]

I want to save my passwords and some other personal data on a ethereum like blockchain. it seems more persistant to me. I may lose my e-mail , my pc may crush and I may lose my usb stick. But nothing ...
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Looking for someone to help me recover stolen BTC [duplicate]

I need help recovering 7.01386067 BTC that was stolen from me through an investment scam. I have included a picture of the blockchain transactions of the bitcoins i purchased: BTC purchased of which ...
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How to automatically get transaction while sending BTC?

Here is my SendBTC method. I do not want to pass fundingTransaction variable each time I call this method. Currently, I pass fundingTransaction value by looking up to https://testnet.smartbit.com.au/. ...
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1answer
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NBitcoin Transaction sign(secret, bool) is giving error. Instead of bool it says to pass Coin Object

I am using NBitcoin (I'm new to it) to sign a transaction. Here Transaction sign(secret, bool) method is giving error. (I've searched the Internet, but got no help.) Instead of bool it says to pass ...
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2answers
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How many addresses can be in input and output of a transaction

I have read through this question and i understand that there can be many sender and receiver addresses within 1 transaction(i'm new to bitcoin transaction, previous i was working with ethereum where ...
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1answer
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How to create bitcoin coin , coinbase transaction?

I know about createrawtransaction '[{"txid":"0000000000000000000000000000000000000000000000000000000000000000","vout":0}]' '{"39jbHRLG6Z2KgXLHR3BWgbccZde1Moo15k"...
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2answers
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in bitcoin core, how to use Tor for broadcasting new transactions only?

I have set up a full node with bitcoin core running on the internet. I have also set up a wallet running on a private machine that communicates to the full node to broadcast new transactions. To ...
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1answer
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How can Forks and Orphan Blocks be used to attack a Blockchain?

So I'm trying to learn about the security aspects of Blockchains and one of the papers I'm reading (https://arxiv.org/pdf/1904.03487.pdf) states that Forks and Orphaned Blocks can be used to attack a ...
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what does segwit remove?

It's said that Segwit removes signature data from transactions which makes block have more space for more transactions. Question 1) If SegWit removes signature data, where does it put it exactly ? ...
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how does node remove conflicting transactions from memory pool?

Sorry for the long text. This is just my observation and was wondering if you could let me know if I am correct or not. Case 1) Let's say minerA and minerB both have the same transaction in their ...
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1answer
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how does node create UTXO from blockchain for the first time?

Let's say I am a new node. I try to synch with the full node to grab the whole blockchain. Now, I synced with it .It's time for my node to create UTXO database .. How does it do this exactly so that ...
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Blocks seem to store only txIDs, where does the transaction data come from for IBD?

I know that blocks store transactions. After looking into a block, I can see that it only stores txIDs. Question 1 - Where are actual transaction objects stored? If you tell me that it's stored in a ...
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1answer
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Is a timestamp in bitcoin different than just the “stamp of time”?

In the "References" section of Bitcoin's whitepaper, Satoshi Nakamoto points to three papers that serve as inspiration for digital timestamping. When you read those documents it is clear ...
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1answer
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Why do other miners check block validity along with proof of work? [duplicate]

I am new to blockchains and bitcoins. So, please pardon the lack of understanding. Assume I am a miner who adds a bogus transaction (say a transfer from my account which has 0 balance to my other ...
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nodes are run to get rewards or just to help bitcoin [duplicate]

I wanted to make a share of my help in bitcoin validation. my question is do Running A Full Node to validate transactions pays reward back or not so I can also benefits from my help to the community
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2answers
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How to you recover a stolen bitcoin lost to an investment scam?

I once lost my bitcoin to an investment platform and it took a while before I managed to get my bitcoin back. My question is I want to know how many people have lost their bitcoin and how do you ...
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1answer
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how does GHOST protocol really work?

I am trying to wrap my head around GHOST protocol... I know it's too much to read, but not my fault. It's GHOST that's complicated (i guess) As I read, it's said that: instead of a longest chain ...
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1answer
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how does bitcoin's 6 confirmation really help?

I've read the following: transaction is “confirmed” once it is buried 6 blocks into the blockchain. This is taken to be a sufficient proof of work such that reversing 6 blocks to double spend coins ...
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1answer
143 views

Blockchain wallet showing 0 however app showing balance

So my blockchain desktop wallet is showing 0 balance whoever if o go in to the app i can see my bitcoin wallet balance. When again i click on the wallet it goes back to 0 in the app for some reason. ...
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1answer
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how does node validate scriptSig

Let's say I sent some BTC to Bob, so I created a transaction (forget about scriptPubKey) since let's say I was able to prove it by executing scriptPubKey. so After I sent BTC to BOB, new transaction's ...
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1answer
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how does bitcoin know which one is utxo? [duplicate]

Let's say John gave 5 BTC to me. So, John took his unspent outputs and put it into inputs to create a transaction. Let's say John already had a transaction which was holding exactly that amount of ...
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1answer
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List of different unknown mining pools

A miner can identify himself when he receive his coinbase transaction, we can view them on website offering block explorer like https://www.blockchain.com/charts/pools Some of these miners are listed ...
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1answer
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Can you verify partial blockchain information from a third party, without yourself having an entire blockchain?

I'm considering consuming, or if unavailable, I'm considering providing, a bitcoin blockchain querying service along the lines of json rpc. Would it be possible for me as a consumer of such as service,...
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anyone can help me recovering my bitcoin bip38 password? [duplicate]

i have bitcoin wallet with more than 1 btc but i cant import it without losing this amount cos i forgot the bip38 password public key: 1CZosSHnf87ZqZ3fRiAuikpzdCZhAKsi3y private key: ...
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1answer
34 views

how and when does block and transaction validations take place?

I have a couple of questions and will try to explain them here. So, let's say we have 4 nodes in the whole network. one of the nodes (node A) took transactions from pool. before they put it into a ...
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1answer
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how to make own coin with soft fork? [closed]

What I am looking to do is soft fork on litecoin and create my own coin! I know that I need to make a node but I can't find any process that shows me how to create my own coin.
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Bitcoin users limit

How bitcoin handle users limit if only 4000 transactions in every 10 minutes ? Let's say I transfer 2 bitcoin to Anuj account then how much time maximum it will take to reflect in Anuj's account and ...
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1answer
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Tiny 1-block forks in blk.dat files

I just completed parsing the Testnet3 Bitcoin blockchain stored in the blk.dat files into a database. Since I was using multi-processing to parse several files at the same time, I didn't add the ...
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1answer
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Zero Day BlockChain Timezone Exploit

Couple weeks ago, a new Blockchain exploit was found by a hacker named: Zer0dayxploit unfortunately, i am not a tech person, but it seems you can earn abt 500$ a day with this exploit! He wrote a ...

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